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CRCT Question. What kind of weather is associated when a cold front approaches an area? sunny skies drizzly rain thunderstorms, heavy rain, or snow hot, muggy weather. Agree or Disagree . The universe is about 13.7 million years old The milky way is a spiral galaxy

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crct question

CRCT Question

What kind of weather is associated when a cold front approaches an area?

sunny skies

drizzly rain

thunderstorms, heavy rain, or snow

hot, muggy weather

agree or disagree
Agree or Disagree
  • The universe is about 13.7 million years old
  • The milky way is a spiral galaxy
  • Stars are classified according to age, picture, temperature
  • Blue-white stars are the hottest
  • Astronomers believe that the universe is expanding
  • We use radiation as evidence that the galaxies are moving apart
  • Salinity of the ocean is approximately 35%
slide3
Are stars still present in the sky during the day time?
  • Yes, we just can’t see them because their dim light is overwhelmed by the brightness of the sun during the day.
galaxies are based on their

0

Galaxies are based on their:
  • Size
  • Shape
  • Brightness
  • Density

What is it most based on?

slide5

Life Cycle

Of

Stars

Video

a nebulas
As the particles pull closer together the temperature increases.

At 10,000,000o C fusion takes place and energy radiates outward through the condensing ball of gas.

Another view of Orion

A. Nebulas
b hydrogen fusion energy of the stars
B. Hydrogen Fusion: Energy of the Stars
  • Stars have large amounts of hydrogen gas.
  • 4 hydrogenatoms fuse forming 1 atom of helium
  • The mass of 4 hydrogen atoms is greater than the mass of 1 helium atom; the excess mass is converted to a tremendous amount of energy.
c red giant
Fusion uses up a star’s hydrogen supply rapidly casing the core to heat up and the outer temperature to fall. (Life cycle of the star)

Star expands and becomes a red giant

Red Giant

C. Red Giant
d stellar evolution
Core continues to heat and star expands to a super giant.

As the core uses up its helium supply, the outer layers escape into space and the remaining core is white hot and called a white dwarf.

White dwarfs

D. Stellar Evolution
e stellar evolution
When no more material is left in the core it explodes into a supernova.

Smaller stars become neutron stars and most massive will collapse into a black hole.

Neutron Star

E. Stellar Evolution
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